Air-conditioning system

ABSTRACT

It is an object of the present disclosure to collectively control an outdoor air handler and an air conditioner optimally. 
     An air-conditioning system ( 100 ) includes an outdoor air handler ( 10 ) configured to adjust a temperature and a humidity of taken-in outdoor air and supply the air to a target space (SP 1 , SP 2 ), an air conditioner ( 20 ) configured to adjust a temperature of air in the target space (SP 1 , SP 2 ), and a control unit ( 30 ). The control unit ( 30 ) is configured to, in a case where one of the outdoor air handler ( 10 ) and the air conditioner ( 20 ) is in a non-temperature adjusting state in which the temperature of the air is not adjusted, change an air conditioning capacity of the other one of the outdoor air handler ( 10 ) and the air conditioner ( 20 ) compared with a case where the outdoor air handler ( 10 ) and the air conditioner ( 20 ) are in a temperature adjusting state in which the temperature of the air is adjusted.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of PCT International Application No.PCT/JP2020/019656 filed on May 18, 2020, which claims priority under 35U.S.C. § 119(a) to Patent Application No. 2019-102256 filed in Japan onMay 31, 2019, all of which are hereby expressly incorporated byreference into the present application.

TECHNICAL FIELD

The present disclosure relates to an air-conditioning system.

BACKGROUND ART

An air-conditioning system including an air conditioner having adefrosting operation function and a heat exchange ventilator capable ofoperating together with the air conditioner has been hitherto known (forexample, PTL 1). The heat exchange ventilator of PTL 1 includes an airsupply fan, an air discharge fan, and a heat exchange element thatenables heat exchange between outdoor air and indoor air. Theair-conditioning system of PTL 1 is configured to suppress an operationof each of the fans of the heat exchange ventilator in the case wherethe air conditioner performs a defrosting operation.

CITATION LIST Patent Literature

PTL 1: Japanese Unexamined Patent Application Publication No. 8-178396

SUMMARY

A first aspect of the present disclosure is directed to anair-conditioning system (100) including an outdoor air handler (10)configured to adjust a temperature and a humidity of taken-in outdoorair and supply the air to a target space (SP1, SP2), and an airconditioner (20) configured to adjust a temperature of air in the targetspace (SP1, SP2). The air-conditioning system (100) includes a controlunit (30) configured to, in a case where one of the outdoor air handler(10) and the air conditioner (20) is in a non-temperature adjustingstate in which the temperature of the air is not adjusted, change an airconditioning capacity of the other one of the outdoor air handler (10)and the air conditioner (20) compared with a case where the outdoor airhandler (10) and the air conditioner (20) are in a temperature adjustingstate in which the temperature of the air is adjusted.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating an example of a configuration of anair-conditioning system according to an embodiment.

FIG. 2 is a refrigerant circuit diagram illustrating an example of aconfiguration of an air conditioner.

FIG. 3 is a flowchart for describing an example of a control operationof the air-conditioning system.

FIG. 4 is a flowchart for describing another example of the controloperation of the air-conditioning system.

FIG. 5 is a flowchart for describing the other example of the controloperation of the air-conditioning system.

DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure will be described below withreference to the drawings. Note that the embodiments below are apreferable example in essence and do not intend to limit the scope ofthe present invention and of the applications or uses thereof.

<Configuration of Air-Conditioning System>

As illustrated in FIG. 1, an air-conditioning system (100) is a systemthat implements air conditioning in a target space included in astructure such as a house, a building, a factory, or a public facility.

In the present embodiment, the air-conditioning system (100) is employedin a building (BL) including a plurality of (for example, two) targetspaces (SP1, SP2). The plurality of target spaces (SP1, SP2) may beseparated indoor spaces or different spaces in the same room. Thebuilding (BL) includes a machine chamber (BL1) in which an outdoor airhandler (10) described later is disposed, an exclusively used section(BL2) where the target spaces (SP1, SP2) are present, and a hallway(BL3) located between the machine chamber (BL1) and the exclusively usedsection (BL2).

As illustrated in FIG. 1, the air-conditioning system (100) includes theoutdoor air handler (10), an air conditioner (20), and a control device(30). The outdoor air handler (10) adjusts a temperature and a humidityof taken-in outdoor air (OA) and supplies the air to the target spaces(SP1, SP2). The outdoor air (OA) is air outside the target spaces (SP1,SP2) (in this example, air outside the building (BL)). The airconditioner (20) adjusts a temperature of air (indoor air) in the targetspaces (SP1, SP2). The control device (30) constitutes a control unit.

In the air-conditioning system (100), in response to input of anappropriate command to a remote control (40) installed in the targetspace (SP1, SP2), operating states of the outdoor air handler (10) andthe air conditioner (20) can be switched. The control device (30)controls the operating states of the outdoor air handler (10) and theair conditioner (20) in accordance with a command (command for on/off,an operating mode, a set temperature, a set air flow rate, or the like)input to the remote control (40), the temperature and the humidity ofthe outdoor air (OA), and the temperature and the humidity of the indoorair, etc.

<Configuration of Outdoor Air Handler>

The outdoor air handler (10) mainly includes an air handling unit (11)(hereinafter, referred to as “AHU”), and a chiller unit (notillustrated) that serves as a heat source unit. The AHU (11) may be of awater type or a refrigerant type (direct-expansion AHU).

While operating, the outdoor air handler (10) takes outdoor air (OA)from an air intake port (15) provided on an outer wall of the building(BL) into the AHU (11) through an air intake duct (L1). The outdoor airhandler (10) cools or heats, or dehumidifies or humidifies the taken-inoutdoor air (OA), and supplies, as to-be-supplied air (SOA), the air tothe target spaces (SP1, SP2) from air supply ports (16) through an airsupply duct (L2).

The outdoor air handler (10) releases, by using an air discharge fan(17), to-be-discharged air (EA) to outside the building (BL) from airdischarge ports (not illustrated) of the target spaces (SP1, SP2)through an air discharge duct (L3).

The AHU (11) mainly includes an outdoor air heat exchanger (12), ahumidifier (13), and an air supply fan (14). The outdoor air heatexchanger (12) includes a heat transfer tube and a heat transfer fin. Inthe outdoor air heat exchanger (12), heat is exchanged between theoutdoor air (OA) that passes around the heat transfer tube and the heattransfer fin and a heat medium that passes through the heat transfertube. The humidifier (13) humidifies the outdoor air (OA) that haspassed around the outdoor air heat exchanger (12). The scheme and thetype of the humidifier (13) are not limited. For example, a commonhumidifier of a naturally evaporating type (evaporative type) may beused. The air supply fan (14) is a fan that takes the outdoor air (OA)into the AHU (11) and sends the outdoor air (OA) to the air supply duct(L2). The type of the air supply fan (14) is not limited. For example, asirocco fan may be used. The air supply fan (14) includes a fan motor.Inverter control is performed on the fan motor, so that the number ofrotations is adjusted. Thus, the air supply fan (14) has a variable airflow rate.

In the AHU (11), various sensors such as, for example, an outdoor airtemperature sensor and an outdoor air humidity sensor that respectivelydetect a temperature and a humidity of the outdoor air (OA) taken intothe AHU (11) and a to-be-supplied air temperature sensor that detects atemperature (to-be-supplied air temperature) of the to-be-supplied air(SOA) sent to the air supply duct (L2) (to the target spaces (SP1, SP2))are disposed.

The air supply duct (L2) is a member that forms a channel for theoutdoor air (OA). One end of the air supply duct (L2) is connected tothe AHU (11) so that the outdoor air (OA) flows thereinto when the airsupply fan (14) operates. The other end of the air supply duct (L2)splits into a plurality of branches. Each of the branches communicateswith a corresponding one of the target spaces (SP1, SP2). Specifically,the other end (each of the branches) of the air supply duct (L2) isconnected to the air supply port (16) formed on the ceiling of thetarget space (SP1, SP2).

The outdoor air handler (10) includes an outdoor-air-handler controlunit (31) that controls an operation of each component of the outdoorair handler (10). The outdoor-air-handler control unit (31) isconstituted by a CPU, a memory, various electric components, etc. Theoutdoor-air-handler control unit (31) is connected to the devicesincluded in the outdoor air handler (10) through wires. Theoutdoor-air-handler control unit (31) is electrically connected to thecontrol device (30) and the remote controls (40) through communicationlines. In the present embodiment, microcomputers and electric componentsdisposed in the AHU (11) and the chiller unit are electrically connectedto each other. In this manner, the outdoor-air-handler control unit (31)is configured.

The outdoor-air-handler control unit (31) sets a target value of ato-be-supplied air temperature in accordance with a set temperature orthe like, and appropriately adjusts an operation of each component onthe basis of the target value. In this manner, an operating capacity(air conditioning capacity) of the outdoor air handler (10) isappropriately changed. Note that the target value of the to-be-suppliedair temperature may be set by the control device (30).

<Configuration of Air Conditioner>

The air conditioner (20) includes a refrigerant circuit (20 a). The airconditioner (20) performs a vapor-compression-type refrigeration cycleby causing refrigerant to circulate through the refrigerant circuit (20a) so as to implement air conditioning such as cooling,dehumidification, or heating in the target spaces (SP1, SP2). The airconditioner (20) has a plurality of operating modes and operates inaccordance with the operating modes. Specifically, the air conditioner(20) performs operations such as a cooling operation for cooling, aheating operation for heating, and a defrosting operation fordefrosting.

The air conditioner (20) mainly includes a single outdoor unit (21) thatserves as a heat source unit, and a plurality of (for example, two)indoor units (22). The type of the air conditioner (20) is not limited.For example, a variable refrigerant volume (VRV) type may be used.

In the air conditioner (20), the outdoor unit (21) and each of theindoor units (22) are connected to each other through a connection pipe(23), so that the refrigerant circuit (20 a) illustrated in FIG. 2 isformed. The kind of the refrigerant sealed in the refrigerant circuit(20 a) is not limited. For example, HFC refrigerant such as R32 or R410Amay be used.

The outdoor unit (21) is disposed outside the target spaces (SP1, SP2)(in this example, outside the building (BL)). The outdoor unit (21)mainly includes a compressor (21 a), a four-way switching valve (21 b),an outdoor heat exchanger (21 c), an outdoor expansion valve (21 d), andan outdoor fan (21 e). The compressor (21 a) is a device that compresseslow-pressure refrigerant in the refrigeration cycle to have a highpressure. The four-way switching valve (21 b) is a channel switchingmeans for switching a flow direction of the refrigerant in therefrigerant circuit (20 a). The outdoor heat exchanger (21 c) is a heatexchanger that enables heat exchange between a passing air flow (outdoorair flow generated by the outdoor fan (21 e)) and the refrigerant. Theoutdoor heat exchanger (21 c) functions as an evaporator of therefrigerant during a forward cycle operation (heating operation) andfunctions as a condenser or a radiator of the refrigerant during areverse cycle operation (cooling operation or defrosting operation). Theoutdoor expansion valve (21 d) is a valve that functions as a pressurereducing means or a flow rate adjusting means for the refrigerant, forexample, an electrically powered expansion valve capable of controllingan opening degree, and is disposed between the outdoor heat exchanger(21 c) and a liquid side connection pipe. The outdoor fan (21 e) is afan that generates the outdoor air flow. The outdoor air flow is a flowof outdoor air that flows into the outdoor unit (21), passes around theoutdoor heat exchanger (21 c), and flows out to the outside of theoutdoor unit (21). The outdoor air flow is a heating source of therefrigerant in the outdoor heat exchanger (21 c) during the forwardcycle operation and is a cooling source of the refrigerant in theoutdoor heat exchanger (21 c) during the reverse cycle operation. Theoutdoor fan (21 e) includes a fan motor. Inverter control is performedon the fan motor, so that the number of rotations is adjusted. Thus, theoutdoor fan (21 e) has a variable air flow rate.

In the outdoor unit (21), various sensors such as, for example, asuction pressure sensor that detects a pressure of the refrigerantsucked to the compressor (21 a) and a discharge pressure sensor thatdetects a pressure of the refrigerant discharged from the compressor (21a) are disposed.

Each of the indoor units (22) is disposed in a corresponding targetspace (SP1, SP2). In the present embodiment, the two indoor units (22)are connected in parallel with each other to the single outdoor unit(21). The type of each of the indoor units (22) is not limited. Forexample, a ceiling-embedded type that is installed at the ceiling of thetarget space (SP1, SP2) may be used. In this case, each of the indoorunits (22) is installed in the corresponding target space (SP1, SP2)such that an intake port and a blow-out port are exposed from theceiling.

Each of the indoor units (22) mainly includes an indoor heat exchanger(22 a), an indoor expansion valve (22 b), and an indoor fan (22 c). Theindoor heat exchanger (22 a) is a heat exchanger that enables heatexchange between a passing air flow (indoor air flow generated by theindoor fan (22 c)) and the refrigerant. The indoor heat exchanger (22 a)functions as a condenser or a radiator of the refrigerant during theforward cycle operation and functions as an evaporator of therefrigerant during the reverse cycle operation. The indoor expansionvalve (22 b) is a valve that functions as a pressure-reducing means or aflow rate adjusting means for the refrigerant, for example, anelectrically powered expansion valve capable of controlling an openingdegree, and is disposed between the indoor heat exchanger (22 a) and theliquid side connection pipe. The indoor fan (22 c) is a fan thatgenerates the indoor air flow. The indoor air flow is a flow of indoorair that flows into the indoor unit (22), passes around the indoor heatexchanger (22 a), and flows out to the outside of the indoor unit (22).The indoor air flow is a cooling source of the refrigerant in the indoorheat exchanger (22 a) during the forward cycle operation and is aheating source of the refrigerant in the indoor heat exchanger (22 a)during the reverse cycle operation. The indoor fan (22 c) includes a fanmotor. Inverter control is performed on the fan motor, so that thenumber of rotations is adjusted. Thus, the indoor fan (22 c) has avariable air flow rate.

In each of the indoor units (22), various sensors such as, for example,an indoor temperature sensor, an indoor humidity sensor, and a CO₂concentration sensor that respectively detect a temperature, a humidity,and a CO₂ concentration of the indoor air flow (indoor air) sucked tothe indoor unit (22) and a refrigerant temperature sensor that detects atemperature of the refrigerant in the indoor heat exchanger (22 a) maybe disposed.

The air conditioner (20) includes an air-conditioner control unit (32)that controls an operation of each component of the air conditioner(20). The air-conditioner control unit (32) is constituted by a CPU, amemory, various electric components, etc. The air-conditioner controlunit (32) is connected to the devices included in the air conditioner(20) through wires. The air-conditioner control unit (32) iselectrically connected to the various sensors disposed in each of theindoor units (22). The air-conditioner control unit (32) is communicablyconnected to the remote controls (40) installed in the target spaces(SP1, SP2). The air-conditioner control unit (32) is electricallyconnected to the control device (30) and the remote controls (40)through communication lines.

In the present embodiment, microcomputers and electric componentsdisposed in the outdoor unit (21) and the indoor units (22) areelectrically connected to each other. In this manner, theair-conditioner control unit (32) is configured. The air-conditionercontrol unit (32) sets a target value of an evaporation temperature ineach of the indoor units (22) in accordance with a set temperature andan indoor temperature, and appropriately adjusts a capacity of thecompressor (21 a) and an air flow rate of the outdoor fan (21 e) on thebasis of the target value. In this manner, an operating capacity (airconditioning capacity) of the air conditioner (20) is appropriatelychanged. Note that the target value of the evaporation temperature maybe set by the control device (30).

<Control Device and Remote Controls>

The control device (30) is a functional unit that comprehensivelycontrols an operation of the air-conditioning system (100).Specifically, the control device (30) includes a computer constituted bya memory, a CPU, and so on. The computer executes a program, so thateach function of the air-conditioning system (100) is implemented. Theprogram is recorded on a computer-readable recording medium, forexample, a ROM or the like.

The control device (30) is electrically connected to theoutdoor-air-handler control unit (31) and the air-conditioner controlunit (32). The control device (30), the outdoor-air-handler control unit(31), and the air-conditioner control unit (32) transmit and receivesignals to and from each other. The control device (30) transmits apredetermined signal (for example, a control signal for setting a targetto-be-supplied air temperature or a target evaporation temperature) tothe outdoor-air-handler control unit (31) and the air-conditionercontrol unit (32), so as to be able to control operations of the devicesthat constitute each of the outdoor air handler (10) and the airconditioner (20). The control device (30) is capable of acquiringdetected values obtained by the various sensors disposed in each of theoutdoor air handler (10) and the air conditioner (20) and informationfor identifying an operating state of each of the outdoor air handler(10) and the air conditioner (20).

The remote control (40) is an input device used by a user to inputvarious commands for individually switching the operating states (suchas on/off, the operating mode, the set temperature, the set humidity,and the set air flow rate) of the outdoor air handler (10) and the airconditioner (20). The remote control (40) also functions as a displaydevice for displaying predetermined information (such as the operatingstates of the outdoor air handler (10) and the air conditioner (20), thetemperature and the humidity of the indoor air, and the temperature andthe humidity of the outdoor air, for example).

<Operations of Air-Conditioning System>

Operations of the air-conditioning system (100) will be described. Theair-conditioning system (100) according to the present embodiment iscapable of selectively performing a common operation and a mixedoperation. The operations are selected by the control device (30).

<<Common Operation>>

The common operation is an operation in which the outdoor air handler(10) and the air conditioner (20) perform an identical operation fromamong a cooling operation and a heating operation. That is, in thecommon operation, the outdoor air handler (10) and the air conditioner(20) perform the cooling operation, or the outdoor air handler (10) andthe air conditioner (20) perform the heating operation. Dehumidificationmay be or may not be performed in the cooling operation, andhumidification may be or may not be performed in the heating operation(the same applies to below).

In the common operation, the air-conditioning system (100) entersdifferent operating modes in the case where the outdoor air handler (10)and the air conditioner (20) are in a temperature adjusting state and inthe case where one of the outdoor air handler (10) and the airconditioner (20) is in a non-temperature adjusting state. Thetemperature adjusting state is a state in which the temperature in thetarget space (SP1, SP2) is adjusted. The non-temperature adjusting stateis a state in which the temperature in the target space (SP1, SP2) isnot adjusted (or cannot be adjusted).

In the common operation, in the case where the outdoor air handler (10)and the air conditioner (20) are in the temperature adjusting state, theair-conditioning system (100) appropriately adjusts the operatingcapacities (air conditioning capacities) of the outdoor air handler (10)and the air conditioner (20) so as to perform air conditioning in thetarget spaces (SP1, SP2). In this case, the air-conditioning system(100) can make full use of the load processing capacity thereof asrequired.

In the common operation, in the case where one of the outdoor airhandler (10) and the air conditioner (20) is in the non-temperatureadjusting state, on the other hand, the air-conditioning system (100)appropriately adjusts the operating capacity (air conditioning capacity)of the other one so as to perform air conditioning in the target spaces(SP1, SP2). In this case, the load processing capacity of theair-conditioning system (100) is limited by the load processing capacityof the other one of the outdoor air handler (10) and the air conditioner(20).

—In Case where Air Conditioner Enters Non-Temperature Adjusting State—

As a specific example, an operation in the case where the airconditioner (20) enters the non-temperature adjusting state from thetemperature adjusting state in the common operation in which the outdoorair handler (10) and the air conditioner (20) perform the heatingoperation will be described with reference to FIG. 3. The flowchart ofFIG. 3 assumes, as the initial state, a state in which the outdoor airhandler (10) and the air conditioner (20) are in the temperatureadjusting state.

As illustrated in FIG. 3, in step ST1, the control device (30) causesthe air conditioner (20) to start a defrosting operation. Consequently,the air conditioner (20) enters the non-temperature adjusting state fromthe temperature adjusting state. The process then proceeds to step ST2.

In step ST2, the control device (30) determines the load processingcapacity of the air conditioner (30) before the air conditioner (20)starts the defrosting operation (the load processing capacity of the airconditioner (20) in the temperature adjusting state). This loadprocessing capacity can be determined as a heat quantity processed bythe air conditioner (20) before the defrosting operation is started. Theprocess then proceeds to step ST3.

In step ST3, the control device (30) determines a surplus capacity ofthe heat source unit (chiller unit) of the outdoor air handler (10).This surplus capacity can be determined from the maximum capacity of theheat source unit and the heating capacity currently exhibited by theheat source unit. The process then proceeds to step ST4.

In step ST4, the control device (30) sets, as an increase amount of theair conditioning capacity of the outdoor air handler (10), the smallerof the load processing capacity of the air conditioner (20) determinedin step ST2 and the surplus capacity of the outdoor air handler (10)determined in step ST3. The process then proceeds to step ST5.

In step ST5, the control device (30) determines an increase α in ato-be-supplied air temperature of the outdoor air handler (10). Thisincrease α can be determined on the basis of the increase amount of theair conditioning capacity of the outdoor air handler (10) set in stepST4 and the current air flow rate of the outdoor air handler (10) suchthat the temperature of the air in the target space (SP1, SP2)approaches the temperature target value. The process then proceeds tostep ST6.

In step ST6, the control device (30) determines whether a value obtainedby adding the increase α to the current to-be-supplied air temperatureof the outdoor air handler (10) is less than an upper-limit value of theto-be-supplied air temperature of the outdoor air handler (10). If theformer value is less than the latter value, the process proceeds to stepST7; otherwise, the process proceeds to step ST8.

In step ST7, the control device (30) stores the value obtained by addingthe increase a to the current to-be-supplied air temperature of theoutdoor air handler (10). The process then proceeds to step ST9.

On the other hand, in step ST8, the control device (30) stores theupper-limit value of the to-be-supplied air temperature of the outdoorair handler (10). The process then proceeds to step ST9.

In step ST9, the control device (30) stores the current target value ofthe to-be-supplied air temperature of the outdoor air handler (10). Theprocess then proceeds to step ST10.

In step ST10, the control device (30) changes the target value of theto-be-supplied air temperature of the outdoor air handler (10) to thevalue stored in step ST7 or step ST8. The process then proceeds to stepST11.

In step ST11, the control device (30) determines whether a condition forending the defrosting operation performed by the air conditioner (20) ismet. If the condition for ending the defrosting operation is not met,step ST11 is repeated. On the other hand, if the condition for endingthe defrosting operation is met, the process proceeds to step ST12.

In step ST12, the control device (30) ends the defrosting operationperformed by the air conditioner (20), and the air conditioner (20)resumes the heating operation. Consequently, the air conditioner (20)enters the temperature adjusting state from the non-temperatureadjusting state. The process then proceeds to step ST13.

In step ST13, the control device (30) determines whether a difference(ΔT) between the temperature (indoor temperature) of the air in thetarget space (SP1, SP2) and the target value (temperature target value)of the indoor temperature is less than a predetermined temperaturethreshold (Th) (for example, 1 to 3° C.). If the difference (ΔT) isgreater than or equal to the temperature threshold (Th), step ST13 isrepeated; otherwise, the process proceeds to step ST14. That is, even ifthe non-temperature adjusting state of the air conditioner (20) ends,the control device (30) maintains the increased air conditioningcapacity of the outdoor air handler (10) until the difference (ΔT)becomes less than the temperature threshold (Th). Step ST13 may beomitted.

In step ST14, the control device (30) changes the target value of theto-be-supplied air temperature of the outdoor air handler (10) to thevalue stored in step ST9 (the value set before the change). That is,after the non-temperature adjusting state of the air conditioner (20)ends, the control device (30) returns the air conditioning capacity ofthe outdoor air handler (10) to the air conditioning capacity set beforethe change.

—In Case where Outdoor Air Handler Enters Non-Temperature AdjustingState—

As another specific example, an operation in the case where the outdoorair handler (10) enters the non-temperature adjusting state from thetemperature adjusting state in the common operation in which the outdoorair handler (10) and the air conditioner (20) perform the coolingoperation will be described.

First, in response to the outdoor air handler (10) entering thenon-temperature adjusting state from the state in which the outdoor airhandler (10) and the air conditioner (20) are in the temperatureadjusting state, the control device (30) determines a load processingcapacity of the outdoor air handler (10) before the state change.

The control device (30) then determines a surplus capacity of the heatsource unit (the outdoor unit (21)) of the air conditioner (20). Thecontrol device (30) sets, as an increase amount of the air conditioningcapacity of the air conditioner (20), the smaller of the surpluscapacity of the outdoor unit (21) and the load processing capacity ofthe outdoor air handler (10) determined above.

To increase the air conditioning capacity of the air conditioner (20) bythe increase amount, the control device (30) then decreases theevaporation temperature (specifically, the target value of theevaporation temperature) in the indoor heat exchanger (22 a). Thecontrol device (30) stores the target value of the evaporationtemperature set before the change.

After the outdoor air handler (10) returns from the non-temperatureadjusting state to the temperature adjusting state, the control device(30) returns the target value of the evaporation temperature to thetarget value of the evaporation temperature set before the change. Evenafter the non-temperature adjusting state of the outdoor air handler(10) ends, if the difference (ΔT) between the temperature (indoortemperature) of the air in the target space (SP1, SP2) and thetemperature target value is not less than the predetermined temperaturethreshold (Th), the decreased target value of the evaporationtemperature may be maintained until the difference (ΔT) becomes lessthan the temperature threshold (Th).

To increase the air conditioning capacity of the air conditioner (20),the control device (30) may increase the air flow rate of the indoor fan(22 c) instead of or in addition to changing the target value of theevaporation temperature of the indoor heat exchanger (22 a).

When the indoor temperature is lower than the temperature target valueby a predetermined value (for example, 0 to 3° C.) or more, the controldevice (30) does not increase the air conditioning capacity of the airconditioner (20). Specifically, when the indoor temperature is lowerthan the temperature target value by the predetermined value or more,the control device (30) does not change the target value of theevaporation temperature of the indoor heat exchanger (22 a) and the airflow rate of the indoor fan (22 c) from the values set when the outdoorair handler (10) is in the temperature adjusting state.

<<Mixed Operation>>

The mixed operation is an operation in which the outdoor air handler(10) and the air conditioner (20) respectively perform one of thecooling operation and the heating operation and the other one of thecooling operation and the heating operation. That is, in the mixedoperation, the outdoor air handler (10) performs the cooling operationand the air conditioner (20) performs the heating operation, or theoutdoor air handler (10) performs the heating operation and the airconditioner (20) performs the cooling operation.

In the mixed operation, the air-conditioning system (100) entersdifferent operating modes in the case where the outdoor air handler (10)and the air conditioner (20) are in the temperature adjusting state andin the case where one of the outdoor air handler (10) and the airconditioner (20) is in the non-temperature adjusting state.

In the mixed operation, in the case where the outdoor air handler (10)and the air conditioner (20) are in the temperature adjusting state, theair-conditioning system (100) appropriately adjusts the operatingcapacities (air conditioning capacities) of the outdoor air handler (10)and the air conditioner (20) so as to perform air conditioning in thetarget spaces (SP1, SP2). In the mixed operation, in the case where oneof the outdoor air handler (10) and the air conditioner (20) is in thenon-temperature adjusting state, on the other hand, the air-conditioningsystem (100) appropriately adjusts the operating capacity (airconditioning capacity) of the other one so as to perform airconditioning in the target spaces (SP1, SP2).

—In Case where Air Conditioner Enters Non-Temperature Adjusting State—

As a specific example, an operation in the case where the airconditioner (20) enters the non-temperature adjusting state from thetemperature adjusting state in the mixed operation in which the outdoorair handler (10) performs the heating operation and the air conditioner(20) performs the cooling operation will be described.

First, in response to the air conditioner (20) entering thenon-temperature adjusting state from the state in which the outdoor airhandler (10) and the air conditioner (20) are in the temperatureadjusting state, the control device (30) determines the load processingcapacity of the air conditioner (20) before the state change.

The control device (30) then determines the current load processingcapacity of the heat source unit (chiller unit) of the outdoor airhandler (10). The control device (30) sets, as a decrease amount of theair conditioning capacity of the outdoor air handler (10), the smallerof the load processing capacity of the air conditioner (20) before thestate change and the current load processing capacity of the outdoor airhandler (10).

To decrease the air conditioning capacity of the outdoor air handler(10) by the decrease amount, the control device (30) then decreases theto-be-supplied air temperature of the outdoor air handler (10). Thecontrol device (30) stores the to-be-supplied air temperature of theoutdoor air handler (10) set before the change.

After the air conditioner (20) returns from the non-temperatureadjusting state to the temperature adjusting state, the control device(30) returns the to-be-supplied air temperature of the outdoor airhandler (10) to the to-be-supplied air temperature set before the change(specifically, increases the to-be-supplied air temperature). Even afterthe non-temperature adjusting state of the air conditioner (20) ends, ifthe difference (ΔT) between the temperature (indoor temperature) of theair in the target space (SP1, SP2) and the temperature target value isnot less than the predetermined temperature threshold (Th), thedecreased to-be-supplied air temperature of the outdoor air handler (10)may be maintained until the difference (ΔT) becomes less than thetemperature threshold (Th).

To decrease the air conditioning capacity of the outdoor air handler(10), the control device (30) may decrease the air flow rate of theoutdoor air handler (10) instead of or in addition to changing theto-be-supplied air temperature of the outdoor air handler (10).

—In Case where Outdoor Air Handler Enters Non-Temperature AdjustingState—

As another specific example, an operation in the case where the outdoorair handler (10) enters the non-temperature adjusting state from thetemperature adjusting state in the mixed operation in which the outdoorair handler (10) performs the cooling operation and the air conditioner(20) performs the heating operation will be described.

First, in response to the outdoor air handler (10) entering thenon-temperature adjusting state from the state in which the outdoor airhandler (10) and the air conditioner (20) are in the temperatureadjusting state, the control device (30) determines the load processingcapacity of the outdoor air handler (10) before the state change.

The control device (30) then determines the current load processingcapacity of the heat source unit (the outdoor unit (21)) of the airconditioner (20). The control device (30) sets, as a decrease amount ofthe air conditioning capacity of the air conditioner (20), the smallerof the load processing capacity of the outdoor air handler (10) beforethe state change and the current load processing capacity of the airconditioner (20).

To decrease the air conditioning capacity of the air conditioner (20) bythe decrease amount above, the control device (30) then decreases thecondensation temperature (specifically, the target value of thecondensation temperature) in the indoor heat exchanger (22 a). Thecontrol device (30) stores the target value of the condensationtemperature set before the change.

After the outdoor air handler (10) returns from the non-temperatureadjusting state to the temperature adjusting state, the control device(30) returns the target value of the condensation temperature to thetarget value of the condensation temperature set before the change. Evenafter the non-temperature adjusting state of the outdoor air handler(10) ends, if the difference (ΔT) between the temperature (indoortemperature) of the air in the target space (SP1, SP2) and thetemperature target value is not less than the predetermined temperaturethreshold (Th), the decreased target value of the condensationtemperature may be maintained until the difference (ΔT) becomes lessthan the temperature threshold (Th).

To decrease the air conditioning capacity of the air conditioner (20),the control device (30) may decrease the air flow rate of the indoor fan(22 c) instead of or in addition to changing the target value of thecondensation temperature in the indoor heat exchanger (22 a).

Advantages of Embodiment 1

The air-conditioning system (100) according to the present embodimentincludes the outdoor air handler (10) configured to adjust a temperatureand a humidity of taken-in outdoor air and supply the air to the targetspace (SP1, SP2); the air conditioner (20) configured to adjust atemperature of air in the target space (SP1, SP2); and the controldevice (30) configured to, in the case where one of the outdoor airhandler (10) and the air conditioner (20) is in the non-temperatureadjusting state in which the temperature of the air is not adjusted,change the air conditioning capacity of the other one of the outdoor airhandler (10) and the air conditioner (20) compared with the case wherethe outdoor air handler (10) and the air conditioner (20) are in thetemperature adjusting state in which the temperature of the air isadjusted. Thus, the temperature in the target space (SP1, SP2) isadjusted by the outdoor air handler (10) and the air conditioner (20).In response to one of the outdoor air handler (10) and the airconditioner (20) entering the non-temperature adjusting state, thecontrol device (30) changes the air conditioning capacity of the otherone compared with the case where both are in the temperature adjustingstate. For example, in response to the outdoor air handler (10) enteringthe non-temperature adjusting state, the control device (30) changes theair conditioning capacity of the air conditioner (20). Thus, the outdoorair handler (10) and the air conditioner (20) can be collectivelycontrolled optimally.

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) perform an identical operation that is the coolingoperation or the heating operation, when the one of the outdoor airhandler (10) and the air conditioner (20) is in the non-temperatureadjusting state, the control device (30) increases the air conditioningcapacity of the other one of the outdoor air handler (10) and the airconditioner (20) compared with the case where the outdoor air handler(10) and the air conditioner (20) are in the temperature adjustingstate. Thus, in response to the one of the outdoor air handler (10) andthe air conditioner (20) entering the non-temperature adjusting state,the air conditioning capacity of the other one increases compared withthe case where both are in the temperature adjusting state.Consequently, a shortage of the air conditioning capacity caused as aresult of the one of the outdoor air handler (10) and the airconditioner (20) entering the non-temperature adjusting state ispartially or entirely compensated for by the other one.

In the air-conditioning system (100) according to the presentembodiment, after the non-temperature adjusting state of the one of theoutdoor air handler (10) and the air conditioner (20) ends, the controldevice (30) returns the air conditioning capacity of the other one ofthe outdoor air handler (10) and the air conditioner (20) to an airconditioning capacity set before the change. Thus, after thenon-temperature adjusting state of the one of the outdoor air handler(10) and the air conditioner (20) ends, an operating state of the otherone is returned to an operating state set in the case where both are inthe temperature adjusting state. Consequently, unnecessary powerconsumption can be suppressed.

In the air-conditioning system (100) according to the presentembodiment, in the case of changing the air conditioning capacity of theoutdoor air handler (10), the control device (30) changes at least oneof a to-be-supplied air temperature and an air flow rate of the outdoorair handler (10). Thus, the air conditioning capacity of the outdoor airhandler (10) changes as a result of the change in at least one of theto-be-supplied air temperature and the air flow rate of the outdoor airhandler (10).

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) perform an identical operation that is the coolingoperation or the heating operation, when the air conditioner (20) is inthe non-temperature adjusting state, the control device (30) increasesthe air conditioning capacity of the outdoor air handler (10), comparedwith the case where the outdoor air handler (10) and the air conditioner(20) are in the temperature adjusting state, such that the smaller ofthe load processing capacity of the air conditioner (20) in thetemperature adjusting state and the surplus capacity of the outdoor airhandler (10) is compensated for. Thus, if the load processing capacityof the air conditioner (20) in the temperature adjusting state issmaller than the surplus capacity of the outdoor air handler (10), theair conditioning capacity of the outdoor air handler (10) is increasedsuch that the load processing capacity of the air conditioner (20) inthe temperature adjusting state is compensated for. On the other hand,if the surplus capacity of the outdoor air handler (10) is smaller thanthe load processing capacity of the air conditioner (20) in thetemperature adjusting state, the air conditioning capacity of theoutdoor air handler (10) is increased such that the surplus capacity ofthe outdoor air handler (10) is compensated for. Consequently, anexcessive load on the outdoor air handler (10) can be avoided.

In the air-conditioning system (100) according to the presentembodiment, in the case where one of the outdoor air handler (10) andthe air conditioner (20) is in the non-temperature adjusting state, whenthe difference (ΔT) between the temperature in the target space (SP1,SP2) and the temperature target value is greater than or equal to thepredetermined temperature threshold (Th), even after the non-temperatureadjusting state of the one of the outdoor air handler (10) and the airconditioner (20) ends, the control device (30) maintains the changed airconditioning capacity of the other one of the outdoor air handler (10)and the air conditioner (20) until the difference (ΔT) between thetemperature in the target space (SP1, SP2) and the temperature targetvalue becomes less than the temperature threshold (Th). Thus, even afterthe non-temperature adjusting state of the one of the outdoor airhandler (10) and the air conditioner (20) ends, if the difference (ΔT)between the temperature in the target space (SP1, SP2) and thetemperature target value is large, the changed air conditioning capacityof the other one is maintained until the difference (ΔT) becomes lessthan the predetermined temperature threshold (Th). Consequently, afterthe non-temperature adjusting state of the one of the outdoor airhandler (10) and the air conditioner (20) ends, the temperature in thetarget space (SP1, SP2) can be made close to the temperature targetvalue in a short time.

In the air-conditioning system (100) according to the presentembodiment, in the case where the air conditioner (20) is in thenon-temperature adjusting state, the control device (30) changes atleast one of the to-be-supplied air temperature and the air flow rate ofthe outdoor air handler (10) such that the temperature in the targetspace (SP1, SP2) approaches the temperature target value. Thus, bychanging at least one of the to-be-supplied air temperature and the airflow rate of the outdoor air handler (10), the temperature in the targetspace (SP1, SP2) can be made close to the temperature target value. Forexample, it is considered that the to-be-supplied air temperature of theoutdoor air handler (10) is increased in the case where the temperaturein the target space (SP1, SP2) is lower than the temperature targetvalue.

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) perform an identical operation that is the coolingoperation or the heating operation, when the outdoor air handler (10) isin the non-temperature adjusting state, the control device (30)increases the air conditioning capacity of the air conditioner (20)compared with the case where the outdoor air handler (10) and the airconditioner (20) are in the temperature adjusting state. Thus, inresponse to the outdoor air handler (10) entering the non-temperatureadjusting state, the air conditioning capacity of the air conditioner(20) increases compared with the case where both the outdoor air handler(10) and the air conditioner (20) are in the temperature adjustingstate. Consequently, a shortage of the air conditioning capacity causedas a result of the outdoor air handler (10) entering the non-temperatureadjusting state is partially or entirely compensated for by the airconditioner (20).

In the air-conditioning system (100) according to the presentembodiment, after the non-temperature adjusting state of the outdoor airhandler (10) ends, the control device (30) returns the air conditioningcapacity of the air conditioner (20) to the air conditioning capacityset before the increase. Thus, after the non-temperature adjusting stateof the outdoor air handler (10) ends, an operating state of the airconditioner (20) is returned to an operating state set in the case whereboth the outdoor air handler (10) and the air conditioner (20) are inthe temperature adjusting state. Consequently, unnecessary powerconsumption can be suppressed.

In the air-conditioning system (100) according to the presentembodiment, the air conditioner (20) includes the indoor heat exchanger(22 a) and the indoor fan (22 c) configured to send the air in thetarget space (SP1, SP2) to the indoor heat exchanger (22 a), and thecontrol device (30) increases the air conditioning capacity of the airconditioner (20) by changing at least one of the air flow rate of theindoor fan (22 c) and the evaporation temperature or the condensationtemperature in the indoor heat exchanger (22 a). Thus, the airconditioning capacity of the air conditioner (20) increases as a resultof the change in at least one of the air flow rate of the indoor fan (22c) and the evaporation temperature or the condensation temperature inthe indoor heat exchanger (22 a).

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) perform the identical operation that is the coolingoperation or the heating operation, when the outdoor air handler (10) isin the non-temperature adjusting state, the control device (30)increases the air conditioning capacity of the air conditioner (20),compared with the case where the outdoor air handler (10) and the airconditioner (20) are in the temperature adjusting state, such that thesmaller of the load processing capacity of the outdoor air handler (10)in the temperature adjusting state and the surplus capacity of the airconditioner (20) is compensated for. Thus, if the load processingcapacity of the outdoor air handler (10) in the temperature adjustingstate is smaller than the surplus capacity of the air conditioner (20),the air conditioning capacity of the air conditioner (20) is increasedsuch that the load processing capacity of the outdoor air handler (10)in the temperature adjusting state is compensated for. On the otherhand, if the surplus capacity of the air conditioner (20) is smallerthan the load processing capacity of the outdoor air handler (10) in thetemperature adjusting state, the air conditioning capacity of the airconditioner (20) is increased such that the surplus capacity of the airconditioner (20) is compensated for. Consequently, an excessive load onthe air conditioner (20) can be avoided.

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) is in thenon-temperature adjusting state, when the difference (ΔT) between thetemperature in the target space (SP1, SP2) and the temperature targetvalue is greater than or equal to the predetermined temperaturethreshold (Th), even after the non-temperature adjusting state of theoutdoor air handler (10) ends, the control device (30) maintains theincreased air conditioning capacity of the air conditioner (20) untilthe difference (ΔT) between the temperature in the target space (SP1,SP2) and the temperature target value becomes less than the temperaturethreshold (Th). Thus, even after the non-temperature adjusting state ofthe outdoor air handler (10) ends, if the difference (ΔT) between thetemperature in the target space (SP1, SP2) and the temperature targetvalue is large, the increased air conditioning capacity of the airconditioner (20) is maintained until the difference (ΔT) becomes lessthan the predetermined temperature threshold (Th). Consequently, afterthe non-temperature adjusting state of the outdoor air handler (10)ends, the temperature in the target space (SP1, SP2) can be made closeto the temperature target value in a short time.

In the air-conditioning system (100) according to the presentembodiment, in the case where the temperature in the target space (SP1,SP2) is higher than the temperature target value by a predeterminedvalue or more during heating or in the case where the temperature in thetarget space (SP1, SP2) is lower than the temperature target value bythe predetermined value or more during cooling, the control device (30)does not increase the air conditioning capacity of the air conditioner(20). Thus, in the case where air conditioning is appropriatelyperformed in the target space (SP1, SP2), the air conditioning capacityof the air conditioner (20) is not increased even when the outdoor airhandler (10) enters the non-temperature adjusting state. Consequently,excessive cooling or heating in the target space (SP1, SP2) can beavoided.

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) respectively perform one of the cooling operation andthe heating operation and the other one of the cooling operation and theheating operation, when one of the outdoor air handler (10) and the airconditioner (20) is in the non-temperature adjusting state, the controldevice (30) decreases the air conditioning capacity of the other one ofthe outdoor air handler (10) and the air conditioner (20) compared withthe case where the outdoor air handler (10) and the air conditioner (20)are in the temperature adjusting state. Thus, in response to the one ofthe outdoor air handler (10) and the air conditioner (20) entering thenon-temperature adjusting state, the air conditioning capacity of theother one decreases compared with the case where both are in thetemperature adjusting state. Consequently, excessive cooling or heatingin the target space (SP1, SP2) as a result of the one of the outdoor airhandler (10) and the air conditioner (20) entering the non-temperatureadjusting state can be avoided.

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) respectively perform one of the cooling operation andthe heating operation and the other one of the cooling operation and theheating operation, when the air conditioner (20) is in thenon-temperature adjusting state, the control device (30) decreases theair conditioning capacity of the outdoor air handler (10) compared withthe case where the outdoor air handler (10) and the air conditioner (20)are in the temperature adjusting state, and after the non-temperatureadjusting state of the air conditioner (20) ends, returns the airconditioning capacity of the outdoor air handler (10) to the airconditioning capacity set before the decrease. Thus, in response to theair conditioner (20) entering the non-temperature adjusting state, theair conditioning capacity of the outdoor air handler (10) decreasescompared with the case where both the outdoor air handler (10) and theair conditioner (20) are in the temperature adjusting state. After thenon-temperature adjusting state of the air conditioner (20) ends, theair conditioning capacity of the outdoor air handler (10) returns to theoriginal.

In the air-conditioning system (100) according to the presentembodiment, in the case where the air conditioning capacity of theoutdoor air handler (10) is decreased, the to-be-supplied airtemperature of the outdoor air handler (10) is changed or the air flowrate of the outdoor air handler (10) is decreased. Thus, the airconditioning capacity of the outdoor air handler (10) decreases as aresult of the change in the to-be-supplied air temperature of theoutdoor air handler (10) or the decrease in the air flow rate of theoutdoor air handler (10).

In the air-conditioning system (100) according to the presentembodiment, in the case where the outdoor air handler (10) and the airconditioner (20) respectively perform one of the cooling operation andthe heating operation and the other one of the cooling operation and theheating operation, when the outdoor air handler (10) is in thenon-temperature adjusting state, the control device (30) decreases theair conditioning capacity of the air conditioner (20) compared with thecase where the outdoor air handler (10) and the air conditioner (20) arein the temperature adjusting state, and after the non-temperatureadjusting state of the outdoor air handler (10) ends, returns the airconditioning capacity of the air conditioner (20) to the airconditioning capacity set before the decrease. Thus, in response to theoutdoor air handler (10) entering the non-temperature adjusting state,the air conditioning capacity of the air conditioner (20) decreasescompared with the case where both the outdoor air handler (10) and theair conditioner (20) are in the temperature adjusting state. After thenon-temperature adjusting state of the outdoor air handler (10) ends,the air conditioning capacity of the air conditioner (20) returns to theoriginal.

In the air-conditioning system (100) according to the presentembodiment, the air conditioner (20) includes the indoor heat exchanger(22 a) and the indoor fan (22 c) configured to send the air in thetarget space (SP1, SP2) to the indoor heat exchanger (22 a), and thecontrol device (30) decreases the air conditioning capacity of the airconditioner (20) by changing at least one of the air flow rate of theindoor fan (22 c) and the evaporation temperature or the condensationtemperature in the indoor heat exchanger (22 a). Thus, the airconditioning capacity of the air conditioner (20) decreases as a resultof the change in at least one of the air flow rate of the indoor fan (22c) and the evaporation temperature or the condensation temperature inthe indoor heat exchanger (22 a).

Modification of Embodiment 1

A modification of Embodiment 1 will be described. The presentmodification differs from Embodiment 1 described above in that thecontrol device (30) increases the air flow rate of the outdoor airhandler (10) in the case where a temperature adjusting capacity of theoutdoor air handler (10) for the target space (SP1, SP2) (that is, acapacity of processing a cooling load or a heating load in the targetspace (SP1, SP2)) is to be increased by increasing the air flow rate ofthe outdoor air handler (10) compared with the case where the controldevice (30) does not increase the air flow rate. Differences fromEmbodiment 1 described above will be mainly described below.

FIGS. 4 and 5 are flowcharts for describing a specific operationperformed in the case where the air conditioner (20) enters thenon-temperature adjusting state from the temperature adjusting state inthe common operation in which the outdoor air handler (10) and the airconditioner (20) perform the heating operation. The flowcharts of FIGS.4 and 5 assume, as the initial state, a state in which the outdoor airhandler (10) and the air conditioner (20) are in the temperatureadjusting state.

In steps ST5 to ST9 of the flowcharts of FIG. 4, it is determinedwhether to increase the air flow rate of the outdoor air handler (10).Steps ST1 to ST4 of FIG. 4 respectively correspond to steps ST1 to ST4of FIG. 3, and steps ST10 to ST18 of FIG. 5 respectively correspond tosteps ST6 to ST14 of FIG. 3. Thus, description is omitted here.

In step ST5, the control device (30) determines an increase α1 in theto-be-supplied air temperature of the outdoor air handler (10) in thecase where the air flow rate of the outdoor air handler (10) is not tobe changed. This increase α1 can be determined on the basis of theincrease amount of the air conditioning capacity of the outdoor airhandler (10) set in step ST4 and the current air flow rate of theoutdoor air handler (10). The process then proceeds to step ST6.

In step ST6, the control device (30) determines an increase α2 in theto-be-supplied air temperature of the outdoor air handler (10) in thecase where the air flow rate of the outdoor air handler (10) is to beincreased. This increase α2 can be determined on the basis of theincrease amount of the air conditioning capacity of the outdoor airhandler (10) set in step ST4, the current air flow rate of the outdoorair handler (10), a rated air flow rate of the outdoor air handler (10),the to-be-supplied air temperature of the outdoor air handler (10), andthe outdoor air temperature.

In step ST7, the control device (30) determines whether a product of theincrease α1 and the current air flow rate of the outdoor air handler(10) is smaller than a product of the increase α2 and the rated air flowrate of the outdoor air handler (10). To make the normal to-be-suppliedair temperature to be substantially equal to the indoor temperature, theproduct of the increase α1 and the current air flow rate and the productof the increase α2 and the rated air flow rate are proportional to aheating capacity for heating to the indoor temperature or higher. Thus,if the former value is not smaller than the latter value, the processproceeds to step ST8; otherwise, the process proceeds to step ST9.

In step ST8, the control device (30) sets the target value of the airflow rate of the outdoor air handler (10) to the current air flow rateof the outdoor air handler (10) and sets the increase α in theto-be-supplied air temperature of the outdoor air handler (10) to theaforementioned increase α1. The process then proceeds to step ST10.

On the other hand, in step ST9, the control device (30) sets the targetvalue of the air flow rate of the outdoor air handler (10) to the ratedair flow rate of the outdoor air handler (10) and sets the increase a inthe to-be-supplied air temperature of the outdoor air handler (10) tothe aforementioned increase α2. The process then proceeds to step ST10.

Advantages of Modification of Embodiment 1

Advantages similar to those of Embodiment 1 described above can beobtained by the air-conditioning system (100) according to the presentmodification.

In the air-conditioning system (100) according to the presentmodification, in the case where the temperature adjusting capacity ofthe outdoor air handler (10) for the target space (SP1, SP2) is to beincreased by increasing the air flow rate of the outdoor air handler(10) compared with the case where the air flow rate is not increased,the control device 30 increases the air flow rate of the outdoor airhandler (10). That is, in the case where increasing the air flow rate ofthe outdoor air handler (10) is effective from the viewpoint oftemperature adjustment in the target space (SP1, SP2), the controldevice (30) increases the air flow rate of the outdoor air handler (10).On the other hand, there may be a case where increasing the air flowrate of the outdoor air handler (10) oppositely affects temperatureadjustment in the target space (SP1, SP2). In such a case, the controldevice (30) does not increase the air flow rate of the outdoor airhandler (10). Consequently, the air flow rate of the outdoor air handler(10) can be optimally controlled.

Other Embodiments

The embodiment described above may be configured as follows.

—First Modification—

For example, in the case where the air conditioner (20) is in thenon-temperature adjusting state, the control device (30) may cause theoutdoor air handler (10) to operate on the basis of return-airtemperature control or indoor temperature control. Each of thereturn-air temperature control and the indoor temperature control refersto controlling the temperature (indoor temperature) of the air in thetarget space (SP1, SP2) on the basis of feedback control. In this case,for example, a quantity to be controlled is the return-air temperatureor the indoor temperature, and a quantity to be operated is theto-be-supplied air temperature or the air flow rate of the outdoor airhandler (10).

—Second Modification—

For example, in the case where the outdoor air handler (10) performs aheating humidifying operation (humidification is performed in theheating operation) and the air conditioner (20) performs the heatingoperation, when the air conditioner (20) is in the non-temperatureadjusting state, the control device (30) may decrease a humidifyingcapacity of the outdoor air handler (10) (specifically, decrease anintake amount of water of the humidifier (13)) and may increase theto-be-supplied air temperature of the outdoor air handler (10), comparedwith the case where the outdoor air handler (10) and the air conditioner(20) are in the temperature adjusting state. In this case, in responseto the air conditioner (20) entering the non-temperature adjustingstate, the control device (30) controls the outdoor air handler (10)such that the heating capacity is prioritized over the humidifyingcapacity. Consequently, a deterioration in a temperature environment ofthe target space (SP1, SP2) as a result of the air conditioner (20)entering the non-temperature adjusting state can be suppressed.

—Third Modification—

For example, the outdoor air handler (10) may include a plurality ofheat source units (chiller units). Even in the case where the airconditioner (20) is in the non-temperature adjusting state, the controldevice (30) does not increase the air conditioning capacity of theoutdoor air handler (10) when all the heat source units are operating.As described above, in the case where all the heat source units areoperating, the control device (30) does not increase the airconditioning capacity of the outdoor air handler (10) by presuming thatthe outdoor air handler (10) substantially no surplus capacity.Consequently, an excessive load on the outdoor air handler (10) can beavoided.

—Fourth Modification—

For example, the air conditioner (20) may be configured to be able toperform the heating humidifying operation. In the case where the outdoorair handler (10) and the air conditioner (20) perform the heatinghumidifying operation, when the outdoor air handler (10) is in thenon-temperature adjusting state, the control device (30) may decreasethe humidifying capacity of the air conditioner (20) and increase thecondensation temperature in the indoor heat exchanger (22 a) of the airconditioner (20) compared with the case where the outdoor air handler(10) and the air conditioner (20) are in the temperature adjustingstate. In this case, in response to the outdoor air handler (10)entering the non-temperature adjusting state, the control device (30)controls the air conditioner (20) such that the heating capacity isprioritized over the humidifying capacity. Consequently, a deteriorationin a temperature environment of the target space (SP1, SP2) as a resultof the outdoor air handler (10) entering the non-temperature adjustingstate can be suppressed.

—Fifth Modification—

For example, in the case where one of the outdoor air handler (10) andthe air conditioner (20) is in the non-temperature adjusting state, thecontrol device (30) may change an environment target value such that theair conditioning load of the air-conditioning system (100) becomes lowerthan an air conditioning load in the case where the outdoor air handler(10) and the air conditioner (20) are in the temperature adjustingstate. Specifically, the environment target value may be a temperaturetarget value (the target value of the temperature in the target space(SP1, SP2)), a humidity target value (the target value of the humidityin the target space (SP1, SP2)), or a CO₂ concentration target value(the target value of the CO₂ concentration in the target space (SP1,SP2)). For example, the control device (30) may change the temperaturetarget value to decrease the cooling load or the heating load of theair-conditioning system (100), may change the humidity target value todecrease a dehumidifying load or a humidifying load of theair-conditioning system (100), or may increase the CO₂ concentrationtarget value to decrease a ventilating load of the outdoor air handler(10). Consequently, an excessive load on the outdoor air handler (10)and the air conditioner (20) can be avoided.

While the embodiments and modifications have been described above, itshould be understood that various modifications can be made on theconfigurations and details without departing from the gist and the scopeof the claims. The embodiments and modifications described above may becombined or replaced as appropriate as long as the functionality of thetarget of the present disclosure is not reduced.

INDUSTRIAL APPLICABILITY

As described above, the present disclosure is useful for anair-conditioning system.

REFERENCE SIGNS LIST

-   -   10 outdoor air handler    -   20 air conditioner    -   22 a indoor heat exchanger    -   22 c indoor fan    -   30 control device (control unit)    -   100 air-conditioning system    -   SP1, SP2 target space    -   Th temperature threshold    -   ΔT (temperature) difference

The invention claimed is:
 1. An air-conditioning system (100)comprising: an outdoor air handler (10) configured to adjust atemperature and a humidity of taken-in outdoor air and supply the air toa target space (SP1, SP2); an air conditioner (20) configured to adjusta temperature of air in the target space (SP1, SP2); and a control unit(30) configured to control the outdoor air handler (10) and the airconditioner (20), wherein each of the outdoor air handler (10) and theair conditioner (20) switches between a temperature adjusting state inwhich the temperature of the air is adjusted and a non-temperatureadjusting state in which the temperature of the air is not adjusted, theoutdoor air handler (10) in the temperature adjusting state adjusts anair conditioning capacity of the outdoor air handler (10) such that thetemperature of the air to be supplied to the target space (SP1,SP2) isto be a target value of a to-be-supplied air temperature, and in a casewhere the outdoor air handler (10) and the air conditioner (20) performa heating operation, when the outdoor air handler (10) is in thetemperature adjusting state and the air conditioner (20) is in thenon-temperature adjusting state, the control unit (30) sets the targetvalue of the to-be-supplied air temperature of the outdoor air handler(10) to be higher than a target value set when the outdoor air handler(10) and the air conditioner (20) are in the temperature adjustingstate.
 2. The air-conditioning system according to claim 1, whereinafter the non-temperature adjusting state of the air conditioner (20)ends, the control unit (30) returns the target value of theto-be-supplied air temperature of the outdoor air handler (10) to atarget value set before the change.
 3. The air-conditioning systemaccording to claim 1, wherein in a case where a temperature adjustingcapacity of the outdoor air handler (10) for the target space (SP1, SP2)is to be increased by increasing an air flow rate of the outdoor airhandler (10) compared with a case where the air flow rate is notincreased, the control unit (30) increases the air flow rate of theoutdoor air handler (10).
 4. The air-conditioning system according toclaim 1, wherein in the case where the outdoor air handler (10) and theair conditioner (20) perform the heating operation, when the airconditioner (20) is in the non-temperature adjusting state, the controlunit (30) determines an increase amount in the target value of theto-be-supplied air temperature such that an increase amount in the airconditioning capacity of the outdoor air handler (10) is to be thesmaller of a load processing capacity exhibited by the air conditioner(20) before the air conditioner (20) enters the non-temperatureadjusting state and a current surplus capacity of the outdoor airhandler (10).
 5. The air-conditioning system according to claim 3,wherein in the case where the outdoor air handler (10) and the airconditioner (20) perform the heating operation, when the air conditioner(20) is in the non-temperature adjusting state, the control unit (30)determines an increase amount in the target value of the to-be-suppliedair temperature such that an increase amount in the air conditioningcapacity of the outdoor air handler (10) is to be the smaller of a loadprocessing capacity exhibited by the air conditioner (20) before the airconditioner (20) enters the non-temperature adjusting state and acurrent surplus capacity of the outdoor air handler (10).
 6. Theair-conditioning system according to claim 1, wherein in the case wherethe air conditioner (20) is in the non-temperature adjusting state, whena difference (ΔT) between the temperature in the target space (SP1, SP2)and a temperature target value is greater than or equal to apredetermined temperature threshold (Th), even after the non-temperatureadjusting state of the air conditioner (20) ends, the control unit (30)maintains the higher target value of the to-be-supplied air temperatureof the outdoor air handler (10) until the difference (ΔT) between thetemperature in the target space (SP1, SP2) and the temperature targetvalue becomes less than the temperature threshold (Th).